You can read all about Douglass's and Truth's opposing experiences and viewpoints in the Key Player Analysis for Frederick. Their little contretemps over the role of God in abolition has been immortalized on Sojourner's gravestone, which asks, "Is God dead?" (Source)

Basically, Frederick D. advocated violence. And our lady Truth thought that the peace needed to be kept.

Both were passionate, driven seekers of equal rights with similarly grim early lives, but those first few years post-escape cemented their different strategies. Frederick was welcomed by the abolitionist cause for his strong oral and writing skills, which focused strongly on the Black man, directly opposing the message in "Ain't I a Woman?"

Sojourner, on the other hand, was taken in by people of faith and continued to have experiences that reaffirmed her beliefs. That faith was foundational to her speaking style. Despite their difference, both were serious movers and shakers toward disrupting the status quo. We'd definitely like to shake both their hands.